Engineering, 15.04.2020 19:50 lauralimon
Aluminum atoms are to be diffused into a silicon wafer using both predeposition and drive-in heat treatments; the background concentration of Al in this silicon material is known to be 3× 1019 atoms/m3. The drive-in diffusion treatment is to be carried out at 1050°C for a period of4.0 h, which gives a junction depth xj of 3.0 μm. Compute the predeposition diffusion time at950°C if the surface concentration is maintained at a constant level of 2 × 1025 atoms/m3. Forthe diffusion of Al in Si, values of Qd and D0 are 3.41 eV and 1.38 × 10-4 m2/s, respectively.
Answers: 2
Engineering, 04.07.2019 12:10
On a average work day more than work place firs are reorted
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Engineering, 04.07.2019 18:10
Hydraulic fluid with a sg. of 0.78 is flowing through a 1.5 in. i.d. pipe at 58 gal/min. the fluid has an absolute viscosity of 11.8 x 105 lbf-sec/ft2. is the flow laminar, turbulent or within the critical range? give both a numerical reynolds number and a term answer.
Answers: 3
Engineering, 04.07.2019 18:10
Aturning operation is performed with following conditions: rake angle of 12°, a feed of 0.35 mm/rev, and a depth of cut of 1.1 mm. the work piece is aluminum alloy 6061 with t6 heat treatment (a16061-t6). the resultant chip thickness was measured to be 1.0 mm. estimate the cutting force, fc. use shear stress of 207 mpa and coefficient of friction on the tool face of 0.6.
Answers: 1
Engineering, 04.07.2019 18:20
Modern high speed trains do not have perpendicular expansion gaps where rails are joined end-to-end any more they are mostly welded together but what might happen if there was a spell of particularly hot weather that causes inspection of the tracks?
Answers: 1
Aluminum atoms are to be diffused into a silicon wafer using both predeposition and drive-in heat tr...
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